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BRISBANE, AUSTRALIA - JANUARY 06: Kei Nishikori of Japan celebrates against Daniil Medvedev of Russia during day eight of the 2019 Brisbane International at Pat Rafter Arena on January 6, 2019 in Brisbane, Australia. (Photo by TPN/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 06: Kei Nishikori of Japan celebrates against Daniil Medvedev of Russia during day eight of the 2019 Brisbane International at Pat Rafter Arena on January 6, 2019 in Brisbane, Australia. (Photo by TPN/Getty Images)